1) Must we call the police?
Yes, we must.
2) Did they have a lot of toys?
Yes, they did.
3) Are you going to invite the Browns?
Yes, I am.
4) Does he have to go there?
Yes, he does.
5) Did they find the coin there?
Yes, they did.
6) Was there a coin there?
Yes, there was.
7) Did it take him an hour to get to the place?
Yes, it did.
8) Is she clever?
Yes, she is.